/Engine/Source/Runtime/Core/Public/Internationalization/Internationalization.h
This function was deprecated as it only provides cultures that use localization resources.FTextLocalizationManager::GetLocalizedCultureNamesprovides a more complete list when using alternate sources, andFInternationalization::GetAvailableCulturescan be used to build a culture array from that list.
void GetCulturesWithAvailableLocalization ( const [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & InLocalizationPaths, [TArray](API\Runtime\Core\Containers\TArray)< FCultureRef > & OutAvailableCultures, const bool bIncludeDerivedCultures )